Skip to content
NC MX-5 Miata Workshop Manual
< Previous   Next >

2008 - MX-5 - Engine

ENGINE TUNE-UP [LF]

Engine Tune-up Preparation

1. Verify the following:

  • AT: Selector lever is in P or N position.

  • MT: Shift lever is in neutral position.

2. Verify that no DTCs are available.
3. Warm up the engine (ECT is approx. 80 °C {176 °F} or more) as follows.
a. Start the engine.
b. Racing at the engine speed 2,500—3,000 rpm for 3 min.
4. Turn off the electrical loads.
5. Wait until the cooling fans stop.
6. Connect the SST (M-MDS) to the DLC‐2.

7. Verify that the idling speed (M-MDS: RPM PID) is within the specification using the M-MDS function.
    Standard

  • AT: 700—800 rpm

  • MT: 670—770 rpm

Ignition Timing Inspection

NOTE:

  • Ignition timing is not adjustable.

  • Ignition timing verification requires M-MDS.

1. Verify that the ignition timing (M-MDS: SPARKADV PID) is within the specification using M-MDS.
    Ignition timing

  • Approx. BTDC 8 °

2. Verify that ignition timing advances when the engine speed increases gradually.

Idle Speed Inspection

NOTE:

  • Idle speed is not adjustable.

  • Idle speed verification requires M-MDS.

1. Verify that the idle speed (M-MDS: RPM PID) is within the specification using M-MDS.
    Idle speed

  • No load: 670—770 rpm (MT), 700—800 rpm (AT)

  • Electrical loads (38—48 A): 700—800 rpm

  • Electrical loads (more than 48 A): 800—900 rpm

  • P/S ON: 700—800 rpm (MT), 750—850 rpm (AT)

  • A/C ON: 825—925 rpm (MT), 775—875 rpm (AT)

Idle Mixture Inspection

1. Verify that the idle speed and ignition timing are within the specification. (See ENGINE TUNE-UP [LF].) (See ENGINE TUNE-UP [LF].)
2. Insert an exhaust gas analyzer to the tailpipe.
3. Verify that the CO and HC concentrations are within the regulation.
    Idle mixture

  • HC concentration: Within the regulation

  • CO concentration: Within the regulation



< Previous   Next >
Back to Top
© 2012 Mazda North American Operations, U.S.A.